suru verb (precursor)
to brush against; to rub together
Classical verb (pre-modern su-verb) meaning things lightly touch or rub against each other. In modern Japanese, 擦れ合う (すれあう) is the usual equivalent.
See also: 擦れ合う (すれあう)
古語では「相摩す」は物が軽く触れ合うことを表した。
In classical Japanese, 相摩す expressed things lightly touching or rubbing against each other.